Seamless can and a method of producing the same

- Toyo Seikan Kaisha, Ltd.
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Claims

1. A seamless can obtained by forming a laminated material of a metal and a polyester film into a cup such that a final draw ratio defined by H/D, where H is equal to said can's height and D is equal to the diameter of said can's bottom portion, is not smaller than 1.5, wherein a polyester (A) on the bottom portion of the can has a biaxial orientation degree Rx defined by the following formula,

2. A seamless can according to claim 1, wherein said polyester (A) has a crystallinity (X) of from 10 to 70% on the bottom portion and said polyester (B) has a crystallinity (X) of from 10 to 70% on the barrel portion.

3. A seamless can according to claim 1, wherein said polyesters (A) and (B) are a copolymerized polyester having a melting point of from 210.degree. to 252.degree. C.

4. A seamless can obtained by forming a laminated material of a metal and a polyester film into a cup such that a final draw ratio defined by H/D, where H is equal to said can's height and D is equal to the diameter of said can's bottom portion, is not smaller than 1.5, wherein a polyester (A) on the bottom portion of the can has a biaxial orientation degree R.sub.X defined by the following formula

Referenced Cited
U.S. Patent Documents
5137762 August 11, 1992 Aizawa et al.
5139889 August 18, 1992 Imazu et al.
5144824 September 8, 1992 Kobayashi et al.
5228588 July 20, 1993 Aizawa et al.
5300335 April 5, 1994 Miyazawa et al.
5360649 November 1, 1994 Sato et al.
Patent History
Patent number: 5700529
Type: Grant
Filed: Feb 2, 1995
Date of Patent: Dec 23, 1997
Assignee: Toyo Seikan Kaisha, Ltd. (Tokyo)
Inventors: Akira Kobayashi (Chigasaki), Hideo Kurashima (Yokosuka), Harumi Sato (Yokohama), Satoshi Fujita (Yokohama), Katsuhiro Imazu (Yokohama)
Primary Examiner: Rena Dye
Law Firm: Sughrue,Mion,Zinn,Macpeak & Seas, PLLC
Application Number: 8/382,639